The Guardian reported earlier that American counter-intelligence forces detected a Russian woman, who had been working for many years in the US Embassy in Moscow and had an access to classified information.
The woman, a Russian national, worked for the US Secret Service for years before she came under suspicion during one of the State Department regional security office's routine security reviews in 2016, the official said.
She was reportedly having regular and unauthorised meetings with members of the FSB, Russia's principle security agency.
The woman was reportedly dismissed from her job last summer over the allegations of her ties to the Russian intelligence, according to the Guardian citing an unnamed U.S. intelligence source.
The unidentified woman, who was sacked in 2017 after her security clearance was revoked, reportedly had access to the secret service's intranet and email systems, potentially giving her access to confidential information, including schedules of the U.S. president and vice-president.
However, a Guardian source reportedly said her dismissal was timed by the Secret Service to occur just after the Kremlin's expulsion of United States diplomatic personnel in order to shield the agency from embarrassment.
The Secret Service said that any claims "regarding a potential security "breach" of U.S. Secret Service systems, information, or reporting is unfounded".
"At no time, in any U.S. Secret Service office, have FSNs been provided or placed in a position to obtain national security information".
"The Secret Service is trying to hide the breach by firing [her]", a source told the British newspaper.
According to The Guardian's anonymous source, "her frequent contacts with the FSB gave her away ... numerous unsanctioned meetings and communications".
Other embassy employees reportedly emailed the woman at her non-work account, breaking protocol and potentially worsening the problem.
Instead the woman was sacked discretely months later, but it was overshadowed by the Kremlin's expulsion of more than 750 USA personnel following sanctions from Washington.
"This is of particular emphasis in Russian Federation", the agency added.
Declining to comment, the State Department simply said the following. As a result, the duties are limited to translation, interpretation, cultural guidance and administrative support.
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